I hear and understand your point. It is not purely a social construct. But how much available farmland to allocate to grow food from the available farmland becomes a political issue. Pricing, distribution... same deal.

And considering our (humanity's) food production outmatches our total food calorie/nutrition requirements... any argument using food as an example for scarcity indicates that you may be working with incorrect, or outdated information.

And Is "money" a social construct, or is there 'natural' money, some platonic ideal from which all other instantiations of money arise? I'm betting on the former.